Hydraulic relay control



April 2l, 1953 s. A. JACQUES 2,635,584

HYDRAULIC RELAY CONTROL Lf a 1441/43 A 14'/ N N :742

l Lx 1R N Jfy 15 QA@ .im

April 21, 1953 s. A. JACQUES 2,635,584

HYDRAULIC RELAY CONTROL Filed Sept. 15, 1950 5 Sheets-Sheet 2 April 21,1953 s. A. JACQUES HYDRAULIC RELAY CONTROL Filed Sept. 15. 1950 5Sheets-Sheet 3 1N VEN TOR.

5/ 16647 L 222 B'icz l juas Q'Z s APY 21, 1953 s. A. JACQUES '2,635,584

HYDRAULIC RELAY CONTROL Filed Sept. 15, 1950 V5 Sheets-Sheet 4 April 21,1953 s. A. JACQUES HYDRAULIC RELAY CONTROL 5 Sheets-Sheet 5 Filed Sept.15, 1950 Patented Apr. 21, `1953 y UNITED $45355@ HYDRAULLQ RELAYCONTROL Stanley A# JtlnssQfChics, Illu' assigns: t9

Ask' R "fitti Qerlnenn Qnics' The present invention relates t0iiydrsnlicsys: temsor ctlialtin'g 'a 'power nuit' d'espe Iy systemarrangement that per'mtsfselle" of the 'particular one' of multipleactuting d 11g thet's't'o accomplish operation of the povyer'unit. Theprsent invention vrelatesl to `corxtrolbf `vrigidbpelfated poweruntffluid 'supply systexn, of the'typ'e that is provided Withtwrn'oxfable o fgl pre1 members; 'movement of each'oif which' t'rls'lowo`f`operatng rfluid tothe pvve'r'urrit;v and yg) en are s'elvejc'ztvelyplaceable in exclusive iontrbl of sch'ow.` In accordance W'ith'therfveritoil the syster'n is so aprra'ngd thaty one of tnejo'ontrolnennst-#which conveniently may bs ,termed'ths fseond'ry one is incontrol of the system'only. whlleth'e' other, convenently 'ter'r'nedythe prr-fV inry member islin al neutral 'pojstion'whe'rein ,it is itselfinencnvs'tt pf'o'dn' 'any Qnefsnnn 'of t/hpower'unt, but upon fmove'mertof the primaryoontrol member from a'netral'psiton to an activeppsition'wnereinit iseff'ectiv to p init 'now of d 'to operate theY'pofw'e'r Auniti@ t 'ol'o'f uid now 'by' the seoondnr'y nlerrnrbr's n'h 'system ,of the invention is 0f s type sito: ydng two"'c`hanne1sfor'oontrolledow ff t thlei nWsr iinitfsnt'h nhsnnelsbsinig ,airs fpr'allel 'connection' between a sonrje o'f Y "andthe pjo'wer @it input;a; nrs; cnanerb izntrll'ed by the Vprimary control r'nlernoen geleend byth'e sel;onola'ryA control member and PS'Ai .dit if v'dY hn's @C tad .v

fg. li 'by'tne primarynonirol'ni I I j unplckthesecond'channerrespecFlg. 4 is a transverse section Op line 44:.-4 9i tee' minlnv@ 4'no1memnsr'isimnvfedfrsm and 35 Eig-.27 s

two chnnels may comprise, and're Eig. 8 is an end elevation of .theuniptgnjfrpgn e Fig. 16 is a fragmentary section on line |3-I6 of Fig.1l.

Fig. 17 is a fragmentary section on line |1|1 of Fig. 11.

Fig. 18 is an enlarged longitudinal section on line |8|8 of Fig. 8.

Fig. 19 is a section on line |9|9 of Fig. 8.

Fig. 20 is a top plan of an assembly not having provision for remotecontrol.

Fig. 21 is a bottom plan of the upper section of Fig. 20.

Figs. 22 to 24 respectively are sections on lines 22-22, 23-23 and 24-24of Fig. 20.

Describing the drawings in detail and rst referring to Fig. l, thedisclosed hydraulic control system is arranged to operate a power unit,shown as a cylinder and piston assembly 24, through selective connectionto a main power fluid input 25 of one of two output lines 26, 21, theother such line being connected to a main exhaust 28. For convenience ofexplanation, lines 26 and 21 are assigned directions, line 26,designated L being assumed to operate the power unit in a leftwarddirection when connected with the input 25, and line 21, designated Rbeing assumed to operate the power unit in a rightward direction whenconnected with the input.

The system vis disclosed as being arranged to provide for selectionbetween relay control of connection of the output lines 26, 21 to theinput 25and exhaust 28 and manually effected selection of connection ofsuch lines to the input and exhaust. The automatic relay control iseffected by an automatic 'control valve 30, and manually controlledoperation is eiected by a manually operable valve 3|. The latter valve3| is a primary or master valve in the sense that its actuation toconnect either line 26, 21 to input 25 and the other to exhaust 28automatically disables pilot valve 30 from control of the output lines26,'21. `The automatic relay valve 30 is shown as a four way spool valveof conventional arrangement, shownas including a spool body 32 that isaxially movable from a neutral or cut oi position to select which of twooutput ports 33, 34 is placed in communication with an input port 35 andwhich with an exhaust port 36. The valve body is shown as movable by aninput signal rod 31 that may be actuated from any suitable signalsource, for example a detector device arranged to measure the conditionof a variable controlled by the power unit of the system.

, The manual valve 3| is arranged to -actuate a transfer valve 40through hydraulic connections that will be described in detail. Transfervalve 40 is a four way valve of conventional arrangement, shown ascomprising a spool body 4| that is axially movable from a cut off orneutral position wherein it is shown, to select which of two outputports 42, 43 is connected with an input port 44.

The body 4| of 'transfer valve 40 is provided at its opposite ends withexpansible chamber actuating assemblies, shown as comprising pistonmembers 45 that respectively are slidable in portions 46, 41 of the borecontaining valve body 4|, which portions respectively serve as cylindersfor the different piston members 45. Loading springs 48 bias body 4| toits central cut off position preventing flow from input port 44 toeither output port 42, 43. Selective connection of one or the otheroutput port to the input port is accomplished by admittance of uid underpressure to 4 one or the other cylinder bores 46, 41 by way of passagelines 49, 50 that may be selectively connected with main input 25, andsimultaneous connection of the other cylinder bore to main exhaust 28,by appropriate positioning of the manual valve 3|. Exhaust ports 5| ofthe transfer valve, connected to exhaust 28 through lines 52, are soarranged as to connect either output port 42, 43 to exhaust when theother output port is connected with the input port 44. Y When pressureswithin the two cylinder bores 46, 41 are equalized by connection of bothto exhaust or supply, transfer valve body 4| is returned to its cut offposition by the loading springs 48.

The respective output ports 42, 43 of transfer valve 4D are connectedwith the main control system output-lines 26, 21 by lines 53. The outputports 33, 34 of automatic relay valve 30 also are connected with themain output lines 26, 21, by lines 54, so that lines 26, 21 respectivelycomprise common outputs for corresponding ones of the paired lines 53and 54. Lines 54, between the output ports 33, 34 of relay valve 30 arecontrolled by a cutoff valve 55 that is actuated automatically in properrelation to operation of the transfer valve 40 to disable control ofpassage of uid to and from the lines 26, 21 by relay valve 30 whenmanual valve 3| is positioned to move the transfer valve from itsneutral position, and to re-establish such control by automatic valve 30when manual valve 3| is positioned to restore transfer valve 40 to itsneutral position.

Cut off valve 55 comprises a spool body 56 arranged to move axiallybetween a position blocking oi passage lines 54 from the automatic valveoutput ports 33, 34 to the output lines 26, 21, and a position whereinit is shown in the drawings, unblocking such passage lines. The twopositions of cut off valve 55 respectively disable the automatic relayvalve 30 from control of the system :and condition the system 'forcontrol by it. Proper coordination of actuation of the cut off valve 55between its two positions with actuation of the transfer valve from andto its neutral position is accomplished by actuating both such valves bymovement of the primary control or manual valve 3|. Somewhat similar tothe cylinder means and biasing springs that actuate the transfer valve40, body 56 of the cut off valve 55 is biased to one of its positions.'which may be either its passage-blocking or unblocking position but isshown as the latter, by means of a loading spring 53, and is providedwith a Ypiston 60 acting in a cylinder bore 6| to move the body againstthe force of spring 59 when fluid under pressure is admitted to cylinderbore 6|. Such controlled admission of pressure fluid is laccomplished bya passage 62 that is controlled by manual valve 3| for automaticconnection to main input 25, or to main exhaust 28, respectively whenthe manual valve 3| is positioned to connect both cylinders 46, 41 ofthe transfer valve actuating assemblies to exhaust to return such Valveto its neutral position, and when either of the transfer valve actuatingcylinders to input 25 to move the transfer valve from its neutralposition. As will be Ydescribed later, the arrangement is such as alsoto provide a system-blocking condition wherein both cut oi valve 55 andtransfer valve 40 are maintained in their cut oif conditions.

The input port 35 of the automatic relay valve 30 being connectedWith'the main uid input 25 by a supply line 63, and the input port 44 oftransfer valve 40 being connected to the main input 25 by a supply line64, it will be seen that twcparellel fluid ew chspeelsare prcvdedbe.tween input ZS-and the mais .output lines 2t. 21. the tiret comprisingpassage 63, .transfer valve.- 4l?A and lines 53, the second comprisingsupply passage 64, relay valve 30, cut 01T valvey 55 and ,lines 54. YProvision is Vmade for automatic relay vcontrol of the second lchannelby valve .730, manually actuated control of the rst channel by valves 3l:and Jil-and. blocking and4 unblocking of the automatically controlledysecond channel in properly coordinated relation with. such manualcontrol. by valves `3l and. 55. This system. arrangement type comprisesche aspect cf the invention. It will be evidentthat-the type ofarrangement is not limited to the disclosed specific types of actuationof valves that control the two channels. Automatic and manual actuation,however'. present a typical and usually desirable alternate controlarrangement.

-; A second aspect of. the invention resides in a .particularlarrangementY for effectively accomplishing the rproperly coordinatedactuation of the valves thatl respectively control the two viiowchannels in such a system arrangement. Referring. to Figs. 2 to 6 inconjunction with Fig. lV4

a .preferred arrangement of the manual orprimary selector valve. 3l .isdisclosed, such arrangement not only being adapted for accomplishing thedesired type of system operation described above, but. additionallybeing .especially arranged for cooperation with a. very simpleandeiective remote control system. Additionally the valve arrangement issuch that a, remote control systemrnay be used o r not without anymodification ofthe valve arrangement itself,

The operating part ofv-alve assembly 3l comprises Va compound valve'body10 that is rotatable in 'a valve bore 1l in a casingstructure 7112 thelatter being provided with controlled ports,` and with supply andexhaust' ,ports that are connectible with the controlled ports bysuitable rotative positioning of the Valve body 1B.. toproducev thecorrelated actuation of transfer'and cut off valves 40, 55 that givevthe systemits intendedoperating characteristics. In Fig.. lfcertainports and cooperativev valve body elements are shown schematically,vFigs. 2 110.6 showinga preferred actualV physical arrangement.

, The valve assembly 3| comprises three sec-.- tions, from left toright. as seen; in Figs. 1 and 2,` a. section between dotted linesv aand: b Of Fig.. 2 that is effective 'to connecty with either supplyy orexhaust a controlled. port 14 ofi line. 49 Ato transfer valve actuatingcylinder 46; a section between. dotted lines b andpc that is effective`'to connect with either supply or exhaust a controlled port 1-5 of line(i2 to the outv oi'valve actuating cylinder 6.1; and a section betweenlines d; and e that iseffective to connect with either supply or exhausta controlled port 16 of .line 50 tor the .second actuating cylinder' 41of transfer valvefw. The left end section, between lines a andatiLcomprises achamber or. recess 11 in valve body 1 ..%l-.;ly:ing betweentwo plug parts 18 19 of such body, and. into *which*v controlled. portV14 opensinall rotative positions of the valve body. Aipnessure Viluidsupply port. 8G. enters valve bore, 12|, in the yiegion'ofY plug, part18,; for registration upon proper rotative positioning.. of. valve body1-U.with:a.channel. 8l inasuch plug part; and the` endof whichopens-into.` chamber' 1:1.A A p'ort182.v

at: presentto b econsidered as exhaust port;

isy also, .arranged for;registrationzwith; channel. 8 I in. a.different: valveilbody'position.. entering valve.15I:.i'n.1ang1ilar1-spacinggfrmmsupplyf;port; 8U.

Anexhaust port -3- also opens into valve .bore 1l man axialpostion forcontrol-of :its communication withr chamber 11 by a pair ofl angularlyspaced valve lugs ,84, 85 projecting axially into chamber 11 lfromthe'second plug vpart 19. .The arrangement of ports 14, and 812, channel8l, and lugs- 214, is shown `by Figs. 2, 3 land 4. The system, asstated, ybeing Vshown in condi-tionfor automatic relay control by valve30, as indicated by the. A.position of the valve body 10, sup-ply port80 is out of register with channel 8 I and consequently controlled port14 is cutoftfrom supply. whilev registration of channel 8| with exhaustSport 82 connects controlled port 14-to `ex--f haust. Consequently, nouid under pressure is being admitted to transfer valve actuatingcylinder 46 and the latter is exhausted. Upon rotation of the valve body10 toits L posi-tion,.1-20 degrees clockwise asscen in Fig. 3 and onlthe indicating dial of Fig. 1, channel 8l will beout of registration.with both supply port 8U andv exhaust port 82, but exhaust portV 83 willbe 11nblocked by both. lugs 84, 85, so actuating Cylinder 46 again willbe exhausted. Upon rotation` of valve body 10 to its. R position, 120degrees counterclockwisf-i as seenV in the noted iigures channel 81 willbe registered withy supply Yporti 80, placing actuating'cylinder 46 incommunication with port 80 through-port 14,. chamber 11 and channel 81,.while exhaust port 82 wil-l be blocked by being out, of register withAthe channel, and exhaust `port 83 will -be blocked by lug 85 aslsuggested by Fig. 4. Betweenthe A or automatic control positionv andleach of the Rl 'andU positions.. as well as between the latter are Npositionaywherein both flow channels to output lines 2S, 21 ,areblocked. In each such position exhaust portr 83 is unblocked V4by bothlugsl 84.,

85 and' chamber 11 and .consequently controlled port 14 and. actuatingcylinder 45l are' connected to exhaust. f

The arrangement of the center valveV section, between lines lb and c ofFig.r 2, is such as: to pro= vide achamber or recess 9c in valve body10:,.into which controlledport 15, of line 6:2 to' the cut 01T vvalve.actuating cylinder 6I, is continually open.` Aperti 9L, at-present tobe consideredcas a supply port, enters valve bore 11.' ata location forregistrationv withv av channel 92 in a plugfpart 93. and the end ofywhich opens into vchamber 9u. Such. registration isv accomplished onlywhen the valve body is inthe single "A"v position.- for. esf-Vtablishing .automatic relay control ofv the system byfvalye V30. AnexhaustA port 9.4 also opens into' valvev bore 1;I and is controlled bya single valve.

lug-95 that projects axially from plug part 19 in angular arrangement.to blockV exhaust:port- 941 fromcommunication withchamber 9B only whenthevalve. body-.is'in the single A orV Automatici position. p l

' Thisv arrangement of the center, orV out: ofi?.r valve-controllingsection. of valve 351i is ,such as toficonnectv the cut olfvalve-actuating cylinder tosupply .port 9 l and-consequently maintain"Vcutoff; valve 55 inxits channel unblocking.l condition:-

onlyuvhen themanual' valve 13 l4 is in its AVT-.position.v all otherpositiona.r whetheriR..L?"'or N the actuating'. cylinder-zV (i l: lis'connected?V to. exhaust throughl chamber and:.port19l4while' supply port9.1.l is blocked fromfchamber 9c by*v bei-ng outv oftregistration..withchannelv 92.'.`

- The third. section ofv valve 311, lying" between lines. daand c of'Fig.. l, is similar tof the. rstasec'-- tion.: except that the supply.and exhaust. ports are; reversedxof connect transferf yvalve: actuatingcylinder 41 to supply'and exhaust in reversed relation to suchconnection of actuating cylinder 46. This third section comprises asupply port |'that enters valve bore 1| in an axial position forregistration with-channel 10| in a plug part 102 andthe end of whichopens into aV chamber or recess ,|03 in valve body 10. Controlled port16 of passage line 50 to the second transfer valveactuatin'gi cylinder41 continually opens into chamber |03. Supply port |00 enters valve bore11 in such angular spacing'from supply port 80 of the first section, andwith respect to the angularpositions of channels 8| and |01 in the R andL positions of the valve body 10, that such ports 80 and |00 are inregistration with channels 8| and 10| only when the valve body isrespectively R and L positions. A port 104. at present to be consideredas an exhaust port, enters valve bore 1| for registration withchannel1|0| only when the valve body is in its automatic position. Anexhaust-port |05 enters valve bore 1| in such angular position relative`to two valve lugs |06, |01 that; extend from a plug part |08 as to beblocked from communication with chamber |03 in the automatic and L`positions of valve body 10.

The .arrangement of the last described valve section issuch that in theR position, channel |0| is out of register with'supply port |00, andexhaust port |05 is in communication with chamber. 103,1 and thereforewith controlled port 16 and transfer valve-actuating cylinder 41, sothat the latter is exhausted. In the L position, channel |01 registerswith supply port |00, to admit pressure uid from port |00 to cylinder 41through chamber |03, controlled port 16 and passage 50, in thiscondition exhaust port |04, being blocked from communication withchamber |03 by being out of register with channel |01, and exhaust port|05 being blocked from cham ber |03 'by lug |06. In the illustratedautomatic or A position, port |04 is registered with channel to connectchamber |03 andv cylinder ,41 to exhaust. In each of the N positionschannel |01 is out of register with supply port |00, and exhaust port105 is in communication with. chamber |03 to exhaust cylinder 41.

It will 4be seen from the foregoing description of the valve assembly3|, that in automatic" position of valve body 10 pressure fluid will beadmitted to cut off valve actuating cylinder 51 to maintain cut offvalve 55 in its unblocking position, but that in all other valve bodypositions cylinder 6| will be connected to exhaust to permit loadingspring 59 to move cut oi .valve 55 to its blocking position. Cylinders46, 41 that actuate transfer valve 40 respectively will be connected tosupply and exhaust in the R posi tion V.of the valve body, and toexhaust and supply in the "L position, while both will be so con# nectedas to balance pressures in the cylinders 46, 41 in both automatic andall N" positions of valve body 10, in the specific arrangement shownsuch balancing being accomplished by connecting both the cylinder boresto exhaust. A The system disclosed by Figs. 1 to 6 is arranged :forremote control by an electric system, and it is for this reason that theports 82, |04 of the two end sections of valve 3|, considered above asexhaust ports, and port 9| of the center section, considered above as asupply port arearranged in the manner shown. Actually each of theseports `82, 92 and |04 acts, for remote control purposes, selectively aseither a supply or an exhaust port, depending on energization ordeenergization of a solenoid that actuates a Vvalve to selectivelyconnect such port with exhaust and supply lines. It is to be noted thatdue to the arrangement vof these remote control ports forregistrationwith the channels 8|, 92, and V|01 only when the valve body10 is in automatic position, remote control by connecting themselectively with supply and exhaust lines can be accomplished only whenthe valve body is in the automatic position. This particular arrangementis not necessarily exclusive, but is regarded as the most useful sinceit permits taking over ofoperation of the system from a remote, vmasterstation when the valve 3| is in itsl automatic position and for somereason, possibly in an emergency, it is desirable to quickly interruptthe automatic relay operation of the system and establish systemactuation under manual control by an operator from such master station.

' Port 82 of the iirst transfer valve-actuating section of valve 3|communicates with the common port of a two way valve |12 that isactuable by a solenoid |13 to selectively connect port with an exhaustport 14, when the solenoid is de-energized as it is shown, and with asupply port |15 when the solenoid is energized.

Port 9| of the cut orf valve-controlling section of valve 3| isconnected with the common port |16 of a two way valve |11, actuable by asolenoid |18 and arranged to connect port |16 with a supply port |19when the solenoid is de-energized, as it is shown, and to connect itwith an exhaust port when the solenoid is energized.

Port |04 of the second transfer-actuating section of valve 3| isconnected with the common port |21 of a two way valve |22, actuable by asolenoid |23 and arranged to connect port |21 with an exhaust port |24when the solenoid is de-energized, as it is shown, and to connect itwith a supply port |25 when the solenoid is energized. Y Y l YEach ofthe two way valves is Ybiased to the position shown by such means as areturn spring 126, and these positions of the two Vway valves place thesystem under control Vof themanual valve 31. Y However, when the latteris in its automatic position, energization of the center solenoid |18 iseffected to connect the cut off valve actuatingv cylinder to exhaustinstead of supply, vby changing port 91 from' a supply port to anexhaust port, through actuation of the two way valve |11 to connect port9| to the exhaust port |20 rather than to supply port |19. When the lefthand solenoid 113 is energized', transfer valve-actuating cylinder 46 isconnected to supply by changing port S2 from an exhaust port to a supplyport, through actuation of two Way valve |12 to connect port 82 tosupply port ||5 instead of exhaust port |14. Similarly, when the righthand solenoid |26 is energized, transfer valve-actuating cylinder 41 isconnected with supply by changing port |04 from an exhaust port to asupply port, through actuation of two way valve |22 to connect port |04to supply port by a. supply'systemincluding branch 'lines |33 accessi 9connected tothe line 54 that supplies the trans.- fer valvey input port44. The main header sup# ply line 64 may also supply input port 35 ofthe automatic relay control valve 30.*The lines 52 of the exhaust systemmay connect exhaust ports of the transfer valve 50, and lines 38 of suchsystem may connect exhaust ports 36 of the automatic control valve 38,to the exhaust manifold line |33 by branch lines |34. Advantageously thebore enclosing the return spring 59 of the cut off valve 55 is connectedwith the exhaust system' through an exhaust line, shown Vas |34,- by aline |35 for bleeding oif any fluid that seeps past the valve body intosuch bore. Pressure relief or safety valves |35 may be used, preferablyconnected'v at some point between the output sides of the cut on andtransfer valves 55, 40, to prevent development of excessive pressures inoutput lines 26, 21 when both of the latter valves are in cut offconditions, as by heating of theuid in such lines by an externalsource.` A throttle valve |31 may be interposed in one of the lines 54for selecting maximum flow rate under relay control by automatic valve30, and

a throttle valve |38 may be interposed in supply line to the transfervalve'f for selecting max'- imum flow rate when the' system is operatedby manual valve 3i and transfer Valve 40.

For remote control operation, an electric system isprovided forselectively` energizing -solenoids |13, I8, |23. For proper remoteoperation, since the center solenoid is effective to move cut ci! valve55 to its blocking position and solenoids |13- and |23 respectively areeffective to establish operating; conditions corresponding to R and Lpositions of Vmanual valve 3 I, it is evident that provision should bemade for energizing solenoids H3, |23 in selectiveV paired relation withsolenoid |18, while provision should be made for energizing the latteralone to establish a fully blocked i of' such source is connected byline |42 to the common, movable contacter of a multi-position switch,Vpreferably having six positions that cor.- respond to the six positionsof manual valve 3l, and which in Fig.. 1 are similarly designated..

Contactor |43 connects to source line |42 .only a t..

line |44, that is connectedwith the second termi.- nal `of the center,or cut ofi valve-actuating sole.- n'oid I I8, when the contacter is inone of'its N positions, thereby connecting cut off valve-actuatingcylinder 5| to exhaust through the two way valve IIT, while bothtransfer valve-actuating cylinders 4E, 41 continue connected to exhaust,sincey solenoids |3, |25 continue de-energized. In the R position,contactor |43 connects to source line |42. a line |45, which connectswith the second end of the coil of solenoid ||3, and also connects thecenter solenoid line |44. with the source line for blocking theautomatic channel simultaneously with shift of transfer valve 40. to

its E position. Similarly, when contacter |43 is moved yto L position itconnectsboth the cut on valve-actuating solenoid line |44 and aline |46'connected with the second side vof the coil of solenoid |23 tosimultaneously energize solenoids and |23. In A position none of 'lines|44,

10 |415., '|40 iscormected to. current source line I l2. and al1solenoids are cle-energized.

A third aspect of thev invention relates to arrangement of a hydrauliccontrol system of. complex nature, typied by the system above de-iscribed, in a uni-tary structuralV arrangement, thereby avoiding all ofthe disadVantagSS and Vinconveniences that arise from using, as thevalves necessary to such a system, independent' units interconnected byindividual pipe lines. extended between the multiple fittings that manysuch valves mustv have, such forv example as valve 3| of Figs. 1' to'6,or transfer valve 40 of Fig. 1.. First referring to the external viewsof such an assembly, Figs. 7 to 10, the unit therein disclosed isarranged in conformity with. Vthe system of Fig. 1 and contains allelements of the system vdis-- closed by suchfigure, with only four pipeeonnec. tions and fittings, which are for the main input 25, the main.exhaust 2,8, andthe output lines 26. 2.1. All. of these valves, and theexhaust andjsupf ply systems necessary to operate them in the de.-scribed-manner, as Well as the lines providing the main ow channels ofthe hydraulic system,.a re formed as bores in a primarily solidblock-like' body, preferably for reasons which will be dis. closed,comprising a .lower main section |50 and a removabletop section I 5 I.vThese sections preferably may be formed from. solid block blanks, valvebores .and passages beingy drilledV into them, as will be described.

The main input comprises a port opening of a bore in top section 15|,vforming `line 64 'and provided with a suitable fitting for connection.of a delivery pipe line, in Fig. 7 designated |53. Thev output lines26, 21 of Fig. 1 may be connected to ports in the bottom surface of thebody member |50, shown in Fig. 10, and designated 2B, 21 to correspondto Fig. 1. The automatic relay valvev assembly 30 is arranged in topsection |5|, W hi1e` the manualy valve assembly 3|, transfer valve 40,.and cut on" valve .55 are all arranged in the lower section Theassemblies of solenoids and two way valves for remote control are seatedon the top surface of a flat part yof the top section, such` partextending forward from a part |56 that houses the automatic relay valve30. The sole-.

noid and valve assemblies of Fig. 1 |12, H3', I1, H8; and |22, |23respectively'are designated |56, |51 and |58 in Figs. 7*,"8, `9 and 12.The main exhaust 28 of Fig. 1 comprises a port, opening. through therear surface of upper section |5|, and provided with a coupling tting|59,V seen in Fig. 8. Throttle valves I 31,. |38 ofv Fig, 1 have.operators projecting respectively from the rear and front surfaces ofthelower section |50., which houses both such valves. The pressure reliefvalves |36 are secured in bores extending from rear surface ofthe lowersection |50, by plugs Referringhowto the internal arrangement of theunit", shown in sections, Figs. 13 to I9, the main supplyv lines', fromwhich. fluid is supplied under pressure to the power unit controlled oroperatedy by the system, are best shown in Figs.

1-3,l 14 and 19. First describing the channel con-` trolled in relayfashion by automatic valve 30...

which channel vis vertical from top to bottom of' the unit .and disposedtoward the rearthereoff.. the input line 63 connects the automaticvalve,

input port 35 to the main fluid Ainput '25through an upper reach ofsupply line 64. As shown in Fig; 1'3, input port 35 is in the forwardside of a -liner |10 wherein the automatic valve .body v32 is axiallyslidable. The automatic valve output 1l ports 33, 34 are at the bottomof the valveassem-Y bly and connectl with vertical bores that form theupper reaches of lines 54, which numeral designates the bores inquestionrin Figs. 11, 13, 14 and 19. Y

Bores 54y include registering portions in the upper and lower bodysections, as seen in Figs. 14 and 19, and they connect with both theYinput ports 51 andr output ports 58 of the cut off valve assembly 55.The latter is shown as arranged in a liner |1| wherein valve body 56 isslidable and which also forms the actuating cylinder 6| for the cut offvalve, as seen best in Fig. 19. The loading spring59 is shown, best inFig. 19, as being supportedin a bore |12'in a valve cap |13 that closesone end of the bore |14 wherein the cut off valve assembly is enclosed.,At the opposite end valve bore |14 isclosed by ay capl15. The bores 54continue downward fromthe `cut off valve output ports 58 to the.mainoutput line ports 26, 21.

l The throttle valve assembly |31for the automatic control channel .isbest shown in Fig. 14. Such assembly is mounted in a bore |16 thatextends from the rear surface of bottom body section |50 and thatintersects one bore 54 and extends past it. A body |11 is AYthreadedinto bore |16, such body having an internal threaded bore wherein isthreaded valve plunger body |18 for axial adjustment by rotation. Theend portion of plunger body` |18 is of a size to completely blockpassage bore 54 when it enters the portion.|19 of bore |16 beyond suchpassage bore. At its end plunger body |18 is provided withavperipherally spaced series of taperedV ports |80 that providecommunication between the sections of bore 54 above and. below thethrottle valve assembly. The effective cross sectional area of thiscommunication is determined by the axial position of plunger body |16,which selects the cross sections of ports |80 where such ports crossthemargin of bore 54. A very ne adjustment of flow rate for service atrelatively low ilow rates is possible by this throttle valvearrangement. If large ow rates are desired for the particularinstallation, or for a particular period of service, the plunger body|18 is simply backed off to clear passage bore |54 to any desiredextent.

' The supply line to transfer valve 40, passage 64, comprises a verticalreach in the upper body section,|5|, and a reach in the bottom section|50 that registers with the first reach and from the location of suchregistration isinclined for-l ward and-downward to a lower verticalreach |85 leading to transfer valve input port 44 which is arranged atthe top of the assembly40. Flow rate through the transferValve-controlled channel may be selected by arrangement of throttle-valve |38 to control the cross sectional area of the vertical reach|85, as shown in Fig. 13. `VThrottle valve assembly |38 is a duplicateof assembly |31 described above, and the same reference numerals areapplied to it in Fig. 13. The body 41 of transfer valve 40 is arrangedin a lliner |86 through the top of which opens input -port 44. Outputpassage bores corresponding to lines 53 of Fig. 1, and indicated by thesame numerals in Figs. 13, 14 and 19, lead from the transfer valveoutput ports 42, 43 to connection with the vertical passage bores 54, asbest seen in Figs. 14 and 19.

The exhaust system of the transfer valve-con-v bores |89,v locatedrearward of the `bores 54, and that in turn open into a horizontalheader bore |90 in the upper body section |5|, shown in Figs. 13, 14 and15, such bore being located in the rear of automatic valve 30 and intowhich open the exhaust ports 36 of the automatic valve assembly 30. Atone end the header borev |90 opens into main exhaust 28. The exhaustpassage bores |88, |89, |90 correspond to the exhaust lines |34 of Fig.1.

Referring to Fig. 18, it will be seen that liner |66 is secured in thetransfer valve bore |95 by a set screw |90. An access bore |91 that isformed during boring of the vertical reach |85 of the supply to thetransfer valve is closed by a plug |98. Transfer Valve loading springs48 are seated in bores |99 of valve caps 200, and in seats 20| in-pistonportions 202 of valve body 4|. These piston portions 202 operate incylinders formed bythe ends of liner |86 and that correspond tocylinders 46, 41 of Fig. 1. The liner |86 has end portions of reduceddiameter providing passage-forming clearances 203 for conducting fluidbetween bores 49, 50, leading from the controlled ports 14, 16 of themanual valve assembly 3|, and the cylinder portions provided within theliner.

The details of the manual valve assembly 3| already have been described,and in Figs. v13vto 24 the same numerals are used. The physicalarrangement, in the blocks that form the body sections |50, |5|, of theports. passages and bores that form the actuating system for thetransfer and cut ofi valves 40, 55 will now be described.

In the top of the bottom body section 4| 50, and opening through the topsurface 205 thereofas best seen in Fig. 11, is formed a groove 206 thatcommunicates with the two vertical exhaust passage bores |89, and thatpreferably extends in a complete loop, as shown, surrounding all of thesupply passages and channels opening through surface v205, thereby toform a trap for any fluid that .may Vescape from the supply betweens'urface 205 and the matching bottom surface 201 ofthe upper section|5|. Channel 206 also serves as an exhaust passage connecting thevarious exhaust ports of the manual Vvalve 3|, and those of the two Wayvalves if remote control provision ismade. to the exhaust bores |89.' Tothis end the exhaust ports 33, 9 4 and |04,of the respective manualValve sections are connected with groove '2 06 by vertical"bores '208.that openthrough the bottom of such groove. The exhaust ports H4, |20,v|24 of the respective two way valves 2, |`|1, |22` are connected tochannel 206, when top section |5| is mounted on bottom section |50, bybores 209 in the body of top section |5|, which bores are so located asto register with channel 206 when the top section is mounted, assuggested by Figs. 13 and 17. 1

Also opening'through the top surface 205 of the lower body section |50is a supply channel 2|0 that communicates with the main input 25- by wayof the supply passage bore 64 when the two body sections are assembled.As best shown by Fig. 11 this channel 2 l0 is generally Y-shaped inplan, and through its bottom open vertical bores 2|| that communicaterespectively with supply ports 80, |00 of the respective transfervalve-actuating sections. of manual valve assembly 3|. The supply ports||5, ||9, |25 of the solenoid-actuated two Way valve assemblies areconnected with supply channel 2 0, when the sections |50, |5| areassembled, by Vertical bores 2|2 `in upper section |5| that open throughthe :names 13 l bottoni-2 surrace 2 0] of such section-inf arrangement,for registration-with, channel 2:10 when mounted on the lower section.The.r remote control-providing'port-s,82;A SII, Ill4r of the respecif.tive sections .of the manual valve assembly 3l are connected with thecommon ports II I, |116, I2I, of the solenoid-actuated. two way' valvevas,- semblies' by vertical boresr 2I3 in the topv and bottombodysections, suchvv boresbeing located to register-when the body sectionsare assembled:

It will be, noted from thefsectional 'iigures;dis closing the internalarrangement of lower'- bodyj section 150; Figs; 13 to 1-9, that certainof' the boresr forming ports opening into manual valve bore 1I' arehorizontal, that somer enter-theL bore` 1I from'v the rear side orsuchhere,A and further@ that passages Y49 and Eil-and thepassage-forming the cut off valve :actuating controlled port 'I5 extenddownward from thev under side off valve bore 1I. The horizontal boressuch as thatV des-f' ignatedI .2M in Fig. 17 which forms; supply 'port00, of the right hand manual valve, sectionLmay'; be'ffor'rned bydrilling from theI iront surface;- .2151 of the lower body sectionl 150,and closing the access `bores that are thus formed` in making the'passages extendilrlg-y from 'the'rear of` valve bore 'l I with. plugs2-I l. Similarly, the 1 bores that; forlzn l'nas'sagesk extended'forwardly of' valveV bore TI are closedr by plugs ZH'. v Somewhatsimilarly; the passages that 'extend downward Ifrom the bottomy of bore'ITIv can be formed" by drilling fromthe 'top surface 205 of body semenlIso', the resultingaccess bores 2 IB being blocked by. the bottom face201 of upper section ll when mounted on section ISD, asshown in* Fig;-162. InI Figi 18 the vertical bore forming controlled port .1i is.dese;`v ignated 224), and in:A Figs. l8r and' llt-he access bore formed'in drilling t'isdesignated v22 I'v The IBB, |89, the Vbores'l'orl'xiinglines 53 and 54; and;v

passage 63 to the input port of' the automatic. valve 30 all may bedrilled from outer surfacesA of: the body members and the access boresformed by such drilling' closed by plugs 222. The bleed passage |35 forhie out ou valve springboe 'may' be lformed similarly; For-useyof thesystem or valves so, 31, luy

body section |550y can be used without "anyl modif flcation, Va modiedtop section 'withoutY the tw@ way valve andsolenold assemblies beingprov1edg; .4. ,mud from Such ,a Source a transfer. valve al? Such amoded' top unit" 'is designated 221 in Figs. 2o to '24. since, when noremote contrer 'operation is provided the portsfSZ 'and' HM oi thef twotransfer valyehactuating sections of A'manual` valve v3| mustl'beexhaust ports'f'or connecting-"the actuating cylinders 46; 41 to exhaustin certail'rv positions of valve body- 10, and port' 91 of thev cut onvalve section of the manual valve must act as a supplyl port, theVmodified topl sect'iorv- 224 is provided wit-h passages arranged tocon-.l

and 55Y withoutI electrical remote control, the 'lowerneet ports 82y andIll4` tov exhaust and port B-I' tof tion |50, by channels '226 Cut illtothe bottom-Of the top section and opening 'through 'its-lower sur-'.vvThese channels 226 are located so that; their opposite ends registerwith the-vertical bores face.

213 that connect with. .ports 82, |04 "and with exhaust channel 205; Achannel 230- similarly As stated. the automaticl or relay control valve30 is arranged in the top section while the cut offfvalve .55. themanual or primary selector valve assembIy 3| and the transfer valve. 46.allk are arranged' in the l'ower'sectionY |56; liurthel'lnore:I the tworparallel flow channels that respectively are controlled by the valve 30and the valve 40 are connectedv in thev top section to .the upper partof passage'64, which formsa common supply input passage 'for theparallel now channels. It will be noted that by this type offarrangement of theA l'yvobody,f sections, in addition to makingprovision, for ready manufacture by making use ofthe matching surfacesoftlietwozsections that arec in face to'face Contact in the assembly forenclosing passagesv formed as grooves in 'one` or both sections; andbydrillingfrom the surface of the'lower section tomakecertain'ofthe-rather complex systeml of communication bores by mean-s"of' which valve actuation is accomplished-also the arrangement oi thevali/e3!! in thetopsecv tion permits selection of any particular form ofvalve that may be required for a particular installation withoutnecessity of makinga 'specie-L ized' construction or arrangement off theentire unit. The lower section I contains all of the elements necessarytothe interlocking ofA blockingi' and unblockin'g valves arranged inparallel flow channels, and thus may be madeas a stand'- 'ardI unit withwhich various types of top sec tions,- selectcd iin. accordance-withthe'v require ments or ay particular installation, nflayv be used'.

' It will' be readily appreciated from the foregoi ing-disclosure thatmany variations maybe made off the arrangements specifically disclosed,and consequently it will be understood that such ar'- rangements arepurelyY exemplary and that the scopeV of the patent is to be'determine'dsolely by 'the appended claims.

I claim:

l. A hydraulic system for actuating a. power unit; comprising meansproviding a pair offsepa rate flow channel-s for parallel' connectionbetweenl a rsource of' iluid under pressure and a power unit to beoperated and at least one ofI which channels comprises a kpair of nowpassages, a supply passageway system for connection te such a fluidsource and an exhaust pas- 'sagf'zwayfv system, said systems includinglines for 'supiplyi tol andexhaust from said channels of transfervalve'tc its neutral position and a pair`l cfexpansible chamberVassemblies each arranged'l tov moves'aid transfer valve in one of itsdirec'- tions of movement when such assembly is con' nested tosaid-supply system and to permitrnove-E mentof saidvalve in the oppositedirection when 'such assembly is connected to the exhaust system,y -aout off valve movable between Vpositions respectively blocking andyuil-blocking-,the other said channel and a hydraulic actuator arranged"tol movesaid lcut off valve between such positionsA upon change `oiconnection of said actua-v tor fromkune said system to the other, andaprimary selector Valve arranged to selectively"` connect either saidexpe-risible tlflau'lber assermbly to the supply system andsimultaneously connect the other to the exhaust system, for moving saidtransfer valve in a selected direction from its neutral position, or toconnect both said assemblies tothe same one of said systems to permitreturn of said transfer valve to its neutral position by said biasingmeans, said primary selector valve also being arranged to reverse theconnection to said systems of said cut olf valve actuator incorrelationwith its connection of said expansible chamber assemblies for movingsaid cut off valve to its channel-blocking position simultaneously withconnection of the two said assemblies to the different systems and tomove said cut olf valve to its channel-unblocking position only whenboth said assemblies are connected to the same one of said systems.

2. A hydraulic system in accordance with claim 1, wherein forsimultaneous blocking of both said channels said primary selector valveis arranged also for connecting both said expansible chamber assembliesto the same one of said supply and exhaust systems and to connect saidcut off valve actuator for movement of the cut off valve to itschannel-blocking position upon connection of said assemblies to thel twodifferent said systems. v

3. A hydraulic system in accordance with claim 1, wherein said primaryselector valve comprises a stationary casing element having therein avalve bore, three controlled ports entering said bore and connectedrespectively with said expansible chamber assemblies and said cut olfvalve actuator; and supply and exhaust ports respectively connected withsaid supply and exhaust systems and entering said valve bore, and avalve body movable in said valve bore and having a formation forselectively establishing, by movement of said body to differentpositions, communication between said controlled ports-.and said supplyand exhaust ports for connection of said expansible chamber assembliesand said actuator to the supply and exhaust systems in the recitedrelations.

. 4. A hydraulic system in accordance with claim 1, including a unitary,primarily solidbody structure provided with bores whereinA are arrangedrespectively all of said valves, assemblies and actuator, said body alsohavingpassage bores providing said supply and` exhaustsystems, linesselector valve and said systems.

5. A hydraulic system in accordance with claim 1, including a unitary,primarily solid body structure provided with bores wherein are arrangedrespectively all of said valves, assemblies and actuator, said bodystructure also having passage bores providing said supply andexhaustsystems, lines and flow channels, and wherein the bore in whichsaidprimary selector valve is arranged is provided withthree controlledportsrespectively connected with the two expansible chamber assemblies andthe cut off valve actuator by communication bores in said bodystructure, said primary selectorvvalve is also provided with supply andexhaust ports respectively connected with said supply and exhaustsystems by communication bores in said body structure, and

wherein said primary selector valve comprises a valve body movable insaid valve boreand having a formation for selectively connecting, by

movement of said body to diierent positions. said 'controlled ports withsaid supply and exhaust ports to connect said assemblies and actuatorwith the supply and exhaust systems in the recited relations.

6. A hydraulic system for controlling operation' of a power unit andthat includes means providing supply and exhaust systems and a pair offlow channels for parallel connection between either said supply or anexhaust system and a power unit and at least one of which channelscomprises a pair of flow passages, a transfer valve having a bodymovable between three positions respectively blocking both such passagesand connecting them in relatively reversed relation to said supply andexhaust systems, a pair of expansible chamber assemblies and biasingmeans for moving said transfer valve body between its said positions, acut off valve for the other ow channel including a body movable betweenpositions wherein respectively it blocks and unblocks said other channeland a hydraulic actuator for moving said cut off valve between its saidpositions, primary selector valve means for controlling actuation ofsaid cut off.

and. transfer valves for selectively unblocking` only a single one ofsaid channels and to select the passages of said transfervalve-controlled channel that are respectively connected to the supplyand exhaust systems when the latter channel is unblocked, said primaryselector valve means comprising a valve casing structure enclosing avalve bore and a valve body rotatable in said bore, said casingstructure and body being arranged to provide three valve sections, saidcasing structure providing a controlled port and supply and exhaustports for each valve section, said ports of each section entering saidbore in spaced arrangement and said body having a valve passage for eachsection, each said valve passage having openings through the surface ofthe valve body for registration with the controlledv ports and selectiveregistration with the supply and exhaust ports of such section, saidcontrolled ports respectively being connected with said expansiblechamber assemblies and actuator and said supply and exhaust portsrespectively being connected with said supply and vexhaust systems, thepositional arrangements of the ports and passage openings of therespective' valve sections the controlled ports of which are connectedto said assemblies being such as topermit, by rotation of said body todifferent positions, simultaneous connection of said expansible chamberassemblies both to the same one of said systems or in selected reversedrelatin to the two systems, and the positional arrangement of ports andpassage openings of the third. section being such as to connect saidactuator to one of said systems for moving said cut ofi valve body toblock said other channel when said expansible chamber assemblies are-`connected to the different systems and to connect said actuator to theother said system for moving the cut off valve body to unblock saidother channel only when said assemblies are connected to the same one ofsaid systems.

'7 YQA` hydraulic system according to claim 6, including an auxiliaryvalve for each said section andY including a common port connected withthe Acontrolled port of such section and a supply` and an exhaust port,and a valve body operable independently of said primary selector valveYbody lfor selectively connecting said con- 17 trolled port to eithersaid supply port or said exhaust port.

8. A hydraulic system according to claim 6, including an auxiliary valvefor each said section and including a common port connected with thecontrolled port of' such section and a supply and an exhaust port, and avalve body operable independently of said primary selector valve bodyfor selectively connecting said con-v trolled port to either said supplyport or said exhaust port, and a selective control system for saidauxiliary valves arranged to selectively connect to the same one of saidsystems both of the controlled ports that are connectedto saidexpansible chamber assemblies or to simultaneously and in selectivereversed relation connect either said assembly to either said system, toactuate the third auxiliary valve to move the cut off valve to itschannel-unblocking position only when both said assemblies are connectedto the same one of said systems, and to actuate` the latter auxiliaryvalveV to move saidl cut off valve body to its channel-unblockingposition only when the two said assemblies are connected t the same oneof said systems.

9. A control unit for a hydraulic power unit, comprising a block-likebody, bores in said body providing a supply system including a supplyinput passage, an output passage, an exhaust system, and a pair of owchannels connected parallelv between said input and output passages. acut o valve comprising a valve element arranged in a valve bore in saidbody for movement between positions respectively blocking and unblockingone said channel, a transfer valve comprising a second valve elementarranged in a second valve bore in said body for movement betweenpositions respectively blocking and unblocking the other said channel,hydraulic actuating devices enclosed by said body and arrangedrespectively for moving said cut off and transfer valve elements, and aprimary selector valve comprising a third valve element arranged in athird bore in said body and movable therein for selecting the positionsof said cut 01T and transfer valve elements by controlling connection ofsaid actuating devices to said supply and exhaust systems throughcommunication bores in saidv body and connecting said actuating devicesand said primary selector valve and said primary selector valve and saidsystems.

10. A control unit for a hydraulic power unit, comprising a block-likebody having therein bores providing a supply system including a supplyinput passage, an output passage, an exhaust system, and a pair of flowchannels connected parallel between said input and output passages,v acut off valve comprising a valve element arranged in a valve bore insaid body for movement between positions respectively block'- ingandunblocking one said channel, a flow control valve comprising a secondvalve element arranged in a second valve bore in said body in serieswith the cut off valve in said channel, Ja transfer valve comprising athird valve element arranged in a third valve bore in said body formovement between positions respectively blocking and unblocking theother said channel, hydraulic actuating devices enclosed by said bodyand arranged respectively for moving said cut off and transfer valvesbetween their posi-` tions, and a primary selector valvecomprising afourth valve element arranged in a fourth valve bore in said body forselecting the posi'- tions of said cut off and transfer valve elementsby controlling connection o'f the different said actuating devices tosaid supply and exhaust systems throughcommunication bores in said bodywhich connect said actuating devices and said primary selector valve andsaid primary selector valve and said systems.

11. A control unit according to claim 10, wherein said body comprisestwo sections, and wherein said flow-control valve is arranged in onesaid section and said cut off, transfer and primary control valves allare arranged in theY other said section.

12. A control unit in accordance with claim 10, wherein said bodycomprises two sections having matching surfaces in face to face contact,and wherein reaches of passages formingv said channels and systems openthrough such surfaces in registered relation.

13. A control unit in accordance with claim 10, lwherein said bodycomprises two sections having matching surfaces in face to face contactand through which reaches of passagesy in the respective sections andforming parts of said systems open in registered relation, and whereinanother passage forming a part of one of said systems comprises a groovein one said section, opening through said surface of said section andclosed by the matching surface of the other said section.

14. A control unit in accordance with claim 10, wherein said bodycomprises two sections having matching surfaces in face to face contactand through which reaches of passages in the respective sections andforming parts of said systems and flow channels open through saidsurfaces in registered relation, and wherein a passage forming part ofsaid exhaust system comprises a groove in one said section and openingthrough its said surface kand said groove extends continuously insurrounding relation to the openings of said flow channel and supplysystem-pro,- viding passages and intersects an exhaust systemprovidingpassage.

15. A control unit for a hydraulic power unit, comprising a block-likebody having therein bores providing a supply system including a supplyinput passage, an output passage, an exhaust system and a pair of flowchannels connected parallel between said input and output passages, acut off valvecomprising a valve element arranged in a valve bore in saidbody for movement between positions respectively blocking and unblockingone said channel, a flow-control valve comprising a second valve elementarranged in a second valve bore in said body in series with said cut offvalve in said one channel, a transfer valve comprising a third valveelement ar-y ranged in a third valve bore in said body for movementbetween positions respectively blocking and unblocking the other saidchannel', h-y draulic actuating devices enclosed by said body andarranged for moving said cut off and transfer valve elements betweentheir different positionsI and a primary selector valve assemblycomprising a fourth valve element movable in a fourth valve bore in saidbody and having plural controlled` ports respectively connected withsaid actuating devices by communication bores in said body, and pluralsupply and exhaust ports respectively connectible with said controlledports by movement of said fourth valve element to different positions',said supply and exhaust ports4 in said body comprises two sectionshaving matching surfaces in face to face contact, reaches of saidchannel-forming and exhaust passages in the respective sections openingthrough said surfaces in registered relation, and wherein saidcommunication bores include supply and exhaust grooves each in one saidsection and opening through its said surface, said channels respectivelybeing connected with said supply and exhaust ports by bores in said bodystructure, and respectively intersecting a channel-forming and anexhaust passage where the latter open through said surfaces.

17. A control unit according to claim 15, wherein said body comprisestwo sections having matching surfaces in face to face contact, saidnow-control valve is arranged in one said section that contains a reachof said supply input passage and said transfer valve is arranged in theother said section and the point of connection of said flow channels tosaid supply input passage is in the section wherein the flow-controlvalve is arranged, reaches in the respective sections of passages thatform parts of said supply and exhaust systems open through said surfacesin registered relation, and wherein said communication bores includesupply and exhaust grooves each in a said section and opening throughthe said surface thereof, said channels respectively being connectedwith said supplyl and exhaust ports by communication bores in the bodysections in which the transfer valve is arranged, and said groovesrespectively intersecting said supply and exhaust-forming passagereaches where the latter open through said surfaces. Y

18. A control unit according to claim 15, wherein said body comprisestwo sections having matching surfaces in face to face contact, saidflow-control valve is arranged in one said section and said transfer andcut off valves are arranged in the other said section, a reach of Saidsupply input passage-is in the section wherein is arranged theflow-control valve and the point of connection of said flow channels tosaid supply input passage is in that same section,

reaches of passages in the respective said sections forming both saidflow channels and of a passage forming part of said exhaust system openthrough said surfaces in registration, and wherein said communicationbores include a supply groove in one said section and opening throughVits said surface, said groove being connected to said supply ports andintersecting the passage forming the ilow channel that is blocked andunblocked by the transfer valve, said communication bores also includingan exhaust groove in one said section and opening through its saidsurface, said exhaust groove being connected to said exhaust ports andextending continuously in surrounding relation to said supply groove andflow channel-forming passages and intersecting said exhaustsystem-forming passage.

19. A control unit in accordance with claim 15, wherein said bodycomprises two sections having matching surfaces in face to face contactand in one of which sections said primary selector valve assembly isarranged, said primary selector valve assembly includes auxiliary portsselectively connectible with said controlled ports by movement of saidfourth valve element to preselected positions, the body section whereinsaid selector valve assembly is arranged being provided with supply andexhaust ports respectively with saidsupply and exhaust systems, and theother said section being provided with communication passagewaysconnecting said auxiliary ports with said systems in selected order.

20. A control unit in accordance with claim l5, wherein said bodycomprises two sections having matching surfaces in face to face contactand in one of which sections said primary selector valve assembly isarranged, said primary selector valve assembly includes auxiliary portsconnectible with said controlled ports by movement of said fourth valveelement to preselected positions, the body section wherein said selectorvalve assembly is arranged is provided with supply and exhaust groovesopening through said section surface and respectively connected withsaid supply and exhaust ports and respectively intersecting differentpassages that open through said surfaces and that respectively formparts of said supply and exhaust systems, and wherein the other saidbody section is provided with communication grooves connected with saidauxiliary ports and with said supply and exhaust grooves in selectedorder. Y

2l. A control unit in accordance with claim other body section beingprovided with plural auxiliary control passageways respectivelyextending from said auxiliary ports and opening through an externalsurface of said section in spaced relation, said section also beingprovided with supply and exhaust passages respectively connected withsaid systems and one of each of which opens through such externalsurface adjacent each said auxiliary control passageways, and said unitincluding plural auxiliary control valves mounted on such externalsurface and respectively arranged to selectively connect said controlpassageways with said supply and exhaust passages.

22. A control unit in accordance with claim 15, wherein said bodycomprises two sections having matching surfaces in face to face contactand in one of which sections said primary selector valve assembly isarranged, said primaryv selector valve assembly includes auxiliary portsselectively connectible with said controlled ports by movement of saidfourth valve element to preselected positions, said body section whereinsaid selector valve assembly is arranged being provided with supply andexhaust grooves opening through said section surface and respectivelyconnected with said supply and exhaust ports and with said supply andexhaust systems, the other said section being provided with pluralauxiliary control passageways respectively extending from said auxiliaryports and opening throughan external surface of said body section, saidsecond body section also being provided with supply and exhaust passagesrespectively connected with said supply and exhaust grooves and openingthrough said external surface adcommunication passageways connectingsaid 7@ jacent each said auxiliary control passageway,

and plural auxiliary control valves mounted on said external surface andrespectively arranged for selectivelyconnecting said auxiliary controlpassageways with either said supply or exhaust passages.

23. A system for delivering fluid to a fluid actuated power unit inresponse to movements of a first of two independently and relativelymovable control members and in response to` movements of the second saidmember only while the iirst occupies a preselected neutraly position;said system comprising means defining iirst and second fluid channelsfor respective control by the different said members, said channelsbeing connected between a common system input for connection to a sourceof fluid under pressureand a common output for con-Y nection to theAsame fluid input of a power unit, first and second valves respectivelyconnected in said iirst and second channels each including a valve bodythat is movable relative to the valve body of the other, said body ofthe first valve being movable to and from positions respectively openingand closing said iirst channel, said body of the second valve beingmovable by said second control member to regulate flow through saidsecond channel, a cut off valve connected in said second channel inseries with said second valve and having a valve body movable betweenpositions wherein respectively it closes and opens said second channelto iiuid flow regulated by said second valve, a pair of fluid operatedactuator devices one connected with said iirst valve body and the otherwith said cut off valve body, and fluid control means for connecting therespective said actuators to exhaust and a source of fluid supply andincluding a selector device operable by movement of the iirst saidcontrol member to its said neutral position to connect the differentsaid actuator devices with said.

supply and exhaust respectively in senses to operate them to move saidiirst valve body to its said position closing said iirst channel and tomove said cut off valve body to its said position wherein it opens saidsecond channel, and by movement of said rst control member from its saidneutral position to connect said actuator devices with supply andexhaust respectively in senses to operate them to move said first andcut off valve bodies respectively to open and close said first andsecond channels.

24. A system in accordance with claim 23,

wherein said iirst channel comprises a pair of ent said passages of thesecond channel with` a, supply passage communicating with said commoninput and with an exhaust passage.

26. A system for delivery of iiuid to a reversible iiuid actuated powerunit having a pair of iiuid inputs, in response to movements of a iirstof two independently and relatively movable control members and inresponse to movements of the second member only while the iirst occupiesa preselected neutral position; said system comprising means definingfirst and second fluid channels for respective control by the differentsaid members, said channels being connected with a common system inputfor connection to a source of iiuid under pressure, and each saidchannel comprising a pair of flow lines, corresponding single lines ofthe different said pairs having common outputs for respective connectionto the different ones of the said two power unit inputs, first andsecond valves respectively connected in said iirst and second channelsand each having a valve body that is movable relative to the valve bodyof the other, said body of the iirst valve being movable in oppositedirections from a neutral position closing both lines of said firstchannel respectively to connect the different said lines in reversedsenses with said common input and with an exhaust line, said body of thesecond valve being movable in opposite directions from a centeredposition respectively to connect said lines of the second channel withsaid common input and an exhaust line, a cut off valve connected in saidsecond channel in series with said second valve and having a valve bodymovable between positions wherein respectively it closes and opens bothlines of said second channel, a pair of actuator devices respectivelyconnected with said iirst valvebody and with said cut off valve body,and means connecting the respective said actuators to the iirst saidcontrol member and operable by movement of the latter to its saidneutral position to move said first valve body to its said positionclosing said iirst channel and to move said cut off valve body to itssaid position wherein it opens said second channel and by movement ofsaid first control member in opposite directions from its said neutralposition to move said cut off valve body to its other said position, andto move said valve body of the flrsi valve respectively in oppositedirections from its neutral position.

STANLEY A. JACQUES;

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 588,946 Bergman Aug. 31, 1897 651,550 Kron June 12, 1900666,429 Lindstrom Jan. 22, 1901 1,375,269 Akemann Apr. 19, 19211,806,669 Campbell May 26, 1931 2,175,800 Hodgman Oct. 10, 19392,189,823 Vickers et al Feb. 13, 1940 2,262,126 Whittles Nov. 11, 19412,512,013 Down June 20, 1950 FOREIGN PATENTS Number Country Date 557,584Germany Aug. 25, 1932

